For decades, renowned oceanographer Sylvia Earle has been sounding the alarm—the Earth’s oceans are dying and we need to protect them, not just for ecological reasons but for our own survival. Her lifelong work is the subject of Mission Blue, a documentary co-directed by Fisher Stevens and Robert Nixon that explores how things like overfishing, oil spills, garbage dumping and polluted runoff have ravaged the ocean over time. - Halil